Do People Who Made Bad Choices Eternally Twiddle their Thumbs?

Lately I'm trying to wrap my brain around the way that I've come to understand the plan of salvation.

It's my own understanding that people who did their personal best and maintained faith in Jesus Christ get exalted, can stay in a family unit, "build their mansion in heaven" so to speak, and eventually create their own worlds and move onward and upward.

I don't have a problem with any of this. However, I've started thinking about people who didn't quite follow through with their personal best or possibly even willfully rebelled. It's been my understanding that they suffer eternally. I understand this to an extent. They would really understand the weight of poor choices (if they knew any better to start with) and they would face consequences for their actions. However, now I have more questions. In the grand scheme of things, do they ever create things on the other side or are they prevented from creating there?

What do they spend their time doing? We're often told that people are so busy on the other side and we're even given ideas of what they might be doing but those are the people busy "furthuring the Lord's work." What is everybody else doing? If they aren't able to create or be productive in some way, what's the point of this punishment eternally?

I understand a punishment but if the goal is to build and increase and improve, why would a whole group of people be eternally incapable of contributing to these tasks? I realize my understanding is infantile and incomplete so this is likely not to be something I get to fully grasp here and the answer may be complex. However, I read this scripture this week: Alma 34:33..."And now, as I said unto you before, as ye have had so many witnesses, therefore, I beseech of you that ye do not procrastinate the day of your repentance until the end; for after this day of life, which is given us to prepare for eternity, behold, if we do not improve our time while in this life, then cometh the night of darkness wherein there can be no labor performed." This DOES sound like those in this predicament don't get to work and build and create on the other side. It makes me wonder so much what they do.

I have many things I'm trying to come to an understanding of and this is just one that I remembered to write about. I would like to be better at finding answers.